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Increase Performance. Add even more horsepower and torque to the rear wheels of your 5.0 Coyote Mustang with a Kooks Catted Shorty X-pipe. The Kooks Catted X-pipe features high flow race catalytic converters to increase overall performance. This Kooks X-pipe is specifically designed to be used with Kooks Long Tube Headers.

Race Car Growl. This free flowing Kooks X-pipe for the 2011-2014 GT Mustangs not only increases power, but it also adds a crisp raspy, race car growl to the sound of your exhaust with its modern "X" crossover pipe design.

Application. This Kooks Shorty Catted X-Pipe is specifically designed to fit the 2011-2014 5.0L GT Mustangs with Kooks Long-Tube Headers installed. The step down to a 2.75" outlet allows for use of the OEM exhaust.

Most Helpful Reviews

4/5

Excellent Catted X-Pipe

I had the Kooks Off road X-pipe on and it was just to loud on start up for the apartment complex I live in. The Kooks catted x-pipe made it more docile and quiter on start up. But didn't ruin the exhaust ...
note while driving, or taking it to redline. Only negative is that there is a potential that the cats may not work as efficient as the ecu requires and throw a DTC code of P0420 and P0430. I was told by Bama that some of the Kooks catted x-pipes work efficient enough and some do not. But with a quick tune change to turn of the rear O2 sensors, everything is great.

6 Questions / 7 Answers

What kind of catback? So I have full long tube headers from kooks and z pipe from kooks.
Should I buy a catback? I don't want any drone or want it too loud.
Since the x pipe is a 3" does the stock catback fit? With
Stock axle back, need advice please help thank you

09gt

Your stock catback will fit just fine into the x-pipe. The odds of having drone occur with your stock catback are slim to none since your stock catback is designed to keep noise at a bare minimum. As far as whether you should keep your stock catback, that's up to you. But to get the full effect of your investment into one of the best header/xpipe set ups on the market as far as performance, you should definitely do a catback, or at bare minimum an axleback. By doing this, you will be completing a smooth flow of air through your exhaust giving you the performance we all crave, but also give you the sound that you and your mustang deserve. I personally run the Corsa Extreme Axleback and cant say enough great things about it. I hope this helps.

Check Engine light If I installed this catted X-pipe with 1/ 7/8 LT KOOKS headers without PCM tuning will the check engine light fire up as the or it will not ?

NoNi

Yes, you will get a CEL but it won't damage anything. The rear O2 sensors are going to get an under efficiency reading so they will need to be turned off or a tune will need to be written to trim out the engine parameters so you run at efficiency level.

Do I need to buy O2 Sensors for the Kooks 1 3/4 Longtube headers with the high flow cat mid/X pipe?? because ill have the car dyno tuned at Jms Chip Performance since I live in Mississippi.
After installation.

andre

Your stock o2 sensors will work just fine with this setup, however you will need the o2 sensor extensions with doings long tubes so they still connect.

I dont see any talk about o2 extensions, do you need them with the high flow catted x pipe or not? thanyou !

Chris

The Kooks High Flow Catted X-pipe will not require O2 sensor extensions for your Downstream (rear) O2 sensors. The Kooks 1-7/8 in. Long Tube Headers will house the upstream (Front) O2 sensors, which should also not require extensions.

It depends if whoever is inspecting your Mustang passes high flow catalytic converters. Usually, when it comes to passing inspection or passing smog tests, I usually tell customers to ask whoever is going to be giving you the pass/fail grade. If they say it will pass than buy it, and if they say won't pass it, then don't buy it.

I had the Kooks Off road X-pipe on and it was just to loud on start up for the apartment complex I live in. The Kooks catted x-pipe made it more docile and quiter on start up. But didn't ruin the exhaust note while driving, or taking it to redline. Only negative is that there is a potential that the cats may not work as efficient as the ecu requires and throw a DTC code of P0420 and P0430. I was told by Bama that some of the Kooks catted x-pipes work efficient enough and some do not. But with a quick tune change to turn of the rear O2 sensors, everything is great.

If you are looking to keep the cats in your exhaust system and really have that x-pipe sound that you're looking for, then this is the one for you. This is my second Kooks set up I have installed, one on a buddy's car and this one on mine and I wouldn't choose any other. It is a little pricey but you are paying for what you are getting. Makes the Coyote sound as it should.

This catted x-pipe looks great and delivers the sound your looking for and makes a nice note inside the car that wont drive you crazy of course it has to be paired with the Kooks headers so if thinking catbacks be careful with your choice. I know some dont like the drone so watch the cat-back issue and dont purchase a super aggressive system because it will be be super loud. AM have all the good products and this is a superior item.

Kooks long tube headers and catted X-pipe are beautifully made and fit well together. Really love the sound of of this set up. Sounds like a race car now and a nice power boost. Can't wait for the next upgrade.

I started working on it a week ago. Finally got it back together last night. Took over 20 hours of my time. You may think you have a full arrangement of tools but this will expose every tool you lack. You need every length extension there is in 1/4,3/8, and 1/2 inch. Every step fights you. Something as simple as reinstalling the starter. The top bolt was nearly impossible to tighten. I'd recommend to put the engine mount in place but install the starter before bolting it in. The a/c lines were in the way. The o2 sensor disconnect was difficult. I have small hands and barely could squeeze in there. Another tip: disconnect the front sensors before raising the engine.

Bought this to replace the cats on my '11 GT. BE AWARE: if you have Kooks long tube headers then you will only be able to use these pipes with the headers. Easy install and good fit. Overall quality is excellent. Only problem is I wish I could buy the catted legs by themselves with out getting a new x-pipe too. AM service is excellent. Pipes arrived two days after I placed my order. Will definitely buy from AM again.

Meet Our Team

My love of cars started after buying my mom’s 1988 turbo coupe as a young lad in high school and working to squeeze every ounce of power out of it as I could. Fast forward many years and vehicles later I was lucky enough to find my 1 owner GT500 from a local dealer bone stock for a great price and j...